For multimode filters modules that have outs for low, band and high pass, can they be used simultaneously?

Absolutely. This is one of the nice things about multiple can use them + an audio mixer to tailor not only the filter's sound, but there's some response tricks that're possible as well. Some of what's possible will depend on the filter in question, of course.

Thanks. That's good to know. I was just thinking of using a filter's bandpass out as the signal that goes to reverb or delay per the mylarmelodies/divkid podcast discussion of reverbs and effects.

That works, too...technically, you could take all VCF outs and send them to differing processing, then into separate VCAs controlled by different modulation signals, with the result being a constantly morphing sound (if you use LFOs) or a sound that changes across its duration (by using differently-set EGs from the same gate source).